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Lib Dem conference: Cable promises £1bn 'business bank
The business secretary will tell the Liberal Democrat conference this will help many small and medium-sized companies who have struggled for credit since the financial crisis.
He will promise to fight short-termism and "get behind" good firms.
The bank will operate via existing lenders, and start within 18 months.
It is hoped the money will be matched by private sector investment.
The details of where the state funding will come from and the bank's operation will not be made public until the autumn statement on 5 December, Lib Dem officials said.
Government support will be in the form of both guarantees and equity, and will go on to the balance sheet of the new institution and not be reclaimed by the Treasury. There is a chance it could generate returns, however.
On Sunday, delegates voted to maintain opposition to a third runway at Heathrow Airport, a policy which puts them at odds with an increasing number of Conservatives and many firms.
But in his speech, Mr Cable will promise a more coherent strategy to help get the UK out of recession.
He will say: "We need a new British Business Bank with a clean balance sheet and an ability to expand lending rapidly to the manufacturers, exporters and high-growth companies that power our economy.
"Today I can announce we will have one. I am working with the chancellor to develop a state-backed institution that will combine up to a billion pounds of new government capital with a larger private sector contribution.
"This will then apply further leverage through guarantees to support up to £10bn of finance to SMEs [small and medium enterprises] and mid-sized business - a significant portion of all the lending available."
He will add: "To that end, I believe we need an industrial strategy - a positive and ambitious vision, built around long-term investment and innovation, in skills and science.
"We are so good at so many things in this country - but for too long the mirage of growth based on property speculation and financial gambling has hidden the harder virtues of making things productively.
"We must get behind successful British-based firms in vehicles, aerospace, life sciences and creative industries and our world-class scientists and universities."
Mr Cable will argue that markets "fail" and governments "can sensibly intervene and support enterprise".
He will call for a "will to fight the British curse of short-termism - both in the corporate world and government".
BBC business editor Robert Peston said the government was aiming for a long-term improvement in lending to small firms rather than a quick change.
He added: "The intention is that these would be longer-term loans with a maturity of about 10 years, that small businesses find hard to prise out of our risk-averse banks."
John Longworth, director general of the British Chambers of Commerce, said the government had "taken a decisive step toward the creation of a British Business Bank by committing real money to get it off the ground.
"We are pleased that ministers are heeding our call to create a business bank that goes well beyond a re-badging of existing schemes.
"The funding announced by Vince Cable is the first step in a journey toward a British business bank that enables new and growing companies to get access to capital in the same way that they do in Germany, South Korea, and the USA."
By Justin Parkinson - Political reporter, BBC News, in Brighton
To find out more about this news: http://www.bbc.co.uk/news/uk-politics-19691162